内管が回転する二重管内の流動抵抗

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In this paper, the resistance of water flow throush co-axial cylinders is studied experimentally, when the inner cylinder rotates. The resistances are measured for six gap sizes (s/r_1=0.0136〜0.115,s : gap, r_1 : radius of inner cylinder) and for various combination of axial and rotational flows. Results obtained are as follows : 1. When the axial flow is laminar, the resistance of flow is unaffected up to a cartain rotating speed (R_<ωe> : critical rotatins Reynolds number), but beyond this speed the flow resistance increases as the R_ω increases. 2. The value of critical Taylor number R_<ωe>(s/r_1)^<1/2> increases as the axial Reynolds number(R_e=v_m s/ν) increases up to a certain value (R_e=600), beyond this value R_<ωe> (s/r_1)^<1/2> decreasee to zero with the increase of R_e. When the axial flow is turbulent, such a critical rotating Reynolds number R_<ωe> cannot be recognized. 3. When R_ω>10 000,resistance coefficient of flow λ can be expressed by [numerical formula]even for small R_e.
一般社団法人日本機械学会の論文
1961-08-25